(CLC) Configurable Logic Cell

The Configurable Logic Cell (CLCx) module provides programmable logic that operates outside the speed limitations of software execution. The logic cell takes up to 64input signals and, through the use of configurable gates, reduces the 64inputs to four logic lines that drive one of eight selectable single-output logic functions.

Input sources are a combination of the following:

I/O pins
Internal clocks
Peripherals
Register bits

The output can be directed internally to peripherals and to an output pin.

Important: There are several CLC instances on this device. Throughout this section, the lower case ‘x’ in register names is a generic reference to the CLC instance number. For example, the first instance of the control register is CLC1CON and is generically described in this chapter as CLCxCON.

The following figure is a simplified diagram showing signal flow through the CLC. Possible configurations include:

Combinatorial Logic:
- AND
- NAND
- AND-OR
- AND-OR-INVERT
- OR-XOR
- OR-XNOR
Latches:
- S-R
- Clocked D with Set and Reset
- Transparent D with Set and Reset
- Clocked J-K with Reset

Figure 1. CLC Simplified Block Diagram

Note:

1.See Figure 1 for input data selection and gating.
2.See Figure 1 for programmable logic functions.